Preparation and characterisation of Ba 3 RE 3 Ti 5 Ta 5 O 30 ceramics

Abstract

Polycrystalline samples of Ba₃RE₃Ti₅Ta₅O₃₀ (RE = Nd, Sm) were prepared by conventional solid state powder processing. The calcined compounds were pelletised and sintered at 1320, 1340, and 1360°C for 4 h. XRD structural and SEM microstructural characterisation showed the formation of single phase material with tetragonal crystal structure. Detailed studies of dielectric properties (ϵ, tanδ) as a function of frequency (100 Hz to 13 MHz) showed that the compounds had a dielectric constant around 120 and a loss factor of 6 × 10 ^{- 3} at 1 MHz. At 1 MHz, the Nd and Sm compounds had dielectric constants of 123 and 117 respectively.